<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        #a1{color: green}
        .b1{color: yellow}
        input[type="text"],p{background-color: red}
        body>div>div>p{color: pink}
        body div div p{background-color: yellow }
        a:link{color: green}/*未访问过*/
        a:visited{color: red}/*已经访问过*/
        a:hover{color: yellow}/*悬停*/
        a:active{color: pink}/*点击*/
    </style>
</head>
<body>
<ul>
    <li>刘备</li>
    <li id="a1">关羽</li>
    <li class="b1">张飞</li>
</ul>
<p>香蕉</p>
<p class="b1">苹果</p>
<input type="text">
<input type="password">
<div>
    <p>p1</p>
    <div><p>p2</p></div>
    <div><div><p>p3</p></div></div>
</div>
<a href="http://www.youku.com">优酷</a>
</body>
</html>